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Blockchain 1.0 --> Currency.
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No, Namecoin, Peercoin, Devcoin,
Freicoin, Memecoin........... where never a currency
Namecoin
Namecoin is an experimental open-source technology which improves decentralization, security, censorship resistance, privacy, and speed of certain components of the Internet infrastructure such as DNS and identities.
Nothing Stake-able is a currency.